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#include "async_updater.h"

#include "utils.h"

#include <library/cpp/tvmauth/client/exception.h>

#include <util/string/builder.h>
#include <util/system/spin_wait.h>

namespace NTvmAuth {
    TAsyncUpdaterBase::TAsyncUpdaterBase() {
        ServiceTicketsDurations_.RefreshPeriod = TDuration::Hours(1);
        ServiceTicketsDurations_.Expiring = TDuration::Hours(2);
        ServiceTicketsDurations_.Invalid = TDuration::Hours(11);

        PublicKeysDurations_.RefreshPeriod = TDuration::Days(1);
        PublicKeysDurations_.Expiring = TDuration::Days(2);
        PublicKeysDurations_.Invalid = TDuration::Days(6);
    }

    NRoles::TRolesPtr TAsyncUpdaterBase::GetRoles() const {
        ythrow TIllegalUsage() << "not implemented";
    }

    TInstant TAsyncUpdaterBase::GetUpdateTimeOfPublicKeys() const {
        return PublicKeysTime_.Get();
    }

    TInstant TAsyncUpdaterBase::GetUpdateTimeOfServiceTickets() const {
        return ServiceTicketsTime_.Get();
    }

    TInstant TAsyncUpdaterBase::GetUpdateTimeOfRoles() const {
        return RolesTime_.Get();
    }

    TInstant TAsyncUpdaterBase::GetInvalidationTimeOfPublicKeys() const {
        TInstant ins = GetUpdateTimeOfPublicKeys();
        return ins == TInstant() ? TInstant() : ins + PublicKeysDurations_.Invalid;
    }

    TInstant TAsyncUpdaterBase::GetInvalidationTimeOfServiceTickets() const {
        TServiceTicketsPtr c = GetCachedServiceTickets();
        return c ? c->InvalidationTime : TInstant();
    }

    bool TAsyncUpdaterBase::ArePublicKeysInvalid(TInstant now) const {
        return IsInvalid(GetInvalidationTimeOfPublicKeys(), now);
    }

    bool TAsyncUpdaterBase::AreServiceTicketsInvalid(TInstant now) const {
        TServiceTicketsPtr c = GetCachedServiceTickets(); 
        // Empty set of tickets is allways valid. 
        return c && !c->TicketsById.empty() && IsInvalid(GetInvalidationTimeOfServiceTickets(), now);
    }

    bool TAsyncUpdaterBase::IsInvalid(TInstant invTime, TInstant now) {
        return invTime -
                   TDuration::Minutes(1) // lag for closing from balancer
               < now;
    }

    void TAsyncUpdaterBase::SetBbEnv(EBlackboxEnv original, TMaybe<EBlackboxEnv> overrided) {
        if (overrided) {
            Y_ENSURE_EX(NUtils::CheckBbEnvOverriding(original, *overrided),
                        TBrokenTvmClientSettings() << "Overriding of BlackboxEnv is illegal: "
                                                   << original << " -> " << *overrided);
        }

        Envs_.store({original, overrided}, std::memory_order_relaxed);
    }

    TServiceTicketsPtr TAsyncUpdaterBase::GetCachedServiceTickets() const {
        return ServiceTickets_.Get();
    }

    TServiceContextPtr TAsyncUpdaterBase::GetCachedServiceContext() const {
        return ServiceContext_.Get();
    }

    TUserContextPtr TAsyncUpdaterBase::GetCachedUserContext(TMaybe<EBlackboxEnv> overridenEnv) const {
        TAllUserContextsPtr ctx = AllUserContexts_.Get();
        if (!ctx) {
            return nullptr;
        }

        const TEnvs envs = Envs_.load(std::memory_order_relaxed);
        if (!envs.Original) {
            return nullptr;
        }

        EBlackboxEnv env = *envs.Original;

        if (overridenEnv) {
            Y_ENSURE_EX(NUtils::CheckBbEnvOverriding(*envs.Original, *overridenEnv),
                        TBrokenTvmClientSettings() << "Overriding of BlackboxEnv is illegal: "
                                                   << *envs.Original << " -> " << *overridenEnv);
            env = *overridenEnv;
        } else if (envs.Overrided) {
            env = *envs.Overrided;
        }

        return ctx->Get(env);
    }

    void TAsyncUpdaterBase::SetServiceTickets(TServiceTicketsPtr c) {
        ServiceTickets_.Set(std::move(c));
    }

    void TAsyncUpdaterBase::SetServiceContext(TServiceContextPtr c) {
        ServiceContext_.Set(std::move(c));
    }

    void TAsyncUpdaterBase::SetUserContext(TStringBuf publicKeys) {
        AllUserContexts_.Set(MakeIntrusiveConst<TAllUserContexts>(publicKeys));
    }

    void TAsyncUpdaterBase::SetUpdateTimeOfPublicKeys(TInstant ins) {
        PublicKeysTime_.Set(ins);
    }

    void TAsyncUpdaterBase::SetUpdateTimeOfServiceTickets(TInstant ins) {
        ServiceTicketsTime_.Set(ins);
    }

    void TAsyncUpdaterBase::SetUpdateTimeOfRoles(TInstant ins) {
        RolesTime_.Set(ins);
    }

    bool TAsyncUpdaterBase::IsServiceTicketMapOk(TServiceTicketsPtr c, size_t expectedTicketCount, bool strict) {
        return c &&
               (strict
                    ? c->TicketsById.size() == expectedTicketCount
                    : !c->TicketsById.empty());
    }

    TAllUserContexts::TAllUserContexts(TStringBuf publicKeys) {
        auto add = [&, this](EBlackboxEnv env) {
            Ctx_[(size_t)env] = MakeIntrusiveConst<TUserContext>(env, publicKeys);
        };

        add(EBlackboxEnv::Prod);
        add(EBlackboxEnv::Test);
        add(EBlackboxEnv::ProdYateam);
        add(EBlackboxEnv::TestYateam);
        add(EBlackboxEnv::Stress);
    }

    TUserContextPtr TAllUserContexts::Get(EBlackboxEnv env) const {
        return Ctx_[(size_t)env];
    }
}